lib/flex/scan.l

   1 /* scan.l - scanner for flex input */
   2
   3 %{
   4 /*-
   5  * Copyright (c) 1990 The Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Vern Paxson.
  10  *
  11  * The United States Government has rights in this work pursuant
  12  * to contract no. DE-AC03-76SF00098 between the United States
  13  * Department of Energy and the University of California.
  14  *
  15  * Redistribution and use in source and binary forms with or without
  16  * modification are permitted provided that: (1) source distributions retain
  17  * this entire copyright notice and comment, and (2) distributions including
  18  * binaries display the following acknowledgement:  ``This product includes
  19  * software developed by the University of California, Berkeley and its
  20  * contributors'' in the documentation or other materials provided with the
  21  * distribution and in all advertising materials mentioning features or use
  22  * of this software.  Neither the name of the University nor the names of
  23  * its contributors may be used to endorse or promote products derived from
  24  * this software without specific prior written permission.
  25  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  26  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  27  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  28  */
  29
  30 /* $Header: /home/daffy/u0/vern/flex/RCS/scan.l,v 2.56 95/04/24 12:17:19 vern Exp $ */
  31
  32 #include "flexdef.h"
  33 #include "parse.h"
  34
  35 #define ACTION_ECHO add_action( yytext )
  36 #define ACTION_IFDEF(def, should_define) \
  37         { \
  38         if ( should_define ) \
  39                 action_define( def, 1 ); \
  40         }
  41
  42 #define MARK_END_OF_PROLOG mark_prolog();
  43
  44 #define YY_DECL \
  45         int flexscan()
  46
  47 #define RETURNCHAR \
  48         yylval = (unsigned char) yytext[0]; \
  49         return CHAR;
  50
  51 #define RETURNNAME \
  52         strcpy( nmstr, yytext ); \
  53         return NAME;
  54
  55 #define PUT_BACK_STRING(str, start) \
  56         for ( i = strlen( str ) - 1; i >= start; --i ) \
  57                 unput((str)[i])
  58
  59 #define CHECK_REJECT(str) \
  60         if ( all_upper( str ) ) \
  61                 reject = true;
  62
  63 #define CHECK_YYMORE(str) \
  64         if ( all_lower( str ) ) \
  65                 yymore_used = true;
  66 %}
  67
  68 %option caseless nodefault outfile="scan.c" stack noyy_top_state
  69 %option nostdinit
  70
  71 %x SECT2 SECT2PROLOG SECT3 CODEBLOCK PICKUPDEF SC CARETISBOL NUM QUOTE
  72 %x FIRSTCCL CCL ACTION RECOVER COMMENT ACTION_STRING PERCENT_BRACE_ACTION
  73 %x OPTION LINEDIR
  74
  75 WS              [[:blank:]]+
  76 OPTWS           [[:blank:]]*
  77 NOT_WS          [^[:blank:]\n]
  78
  79 NL              \r?\n
  80
  81 NAME            ([[:alpha:]_][[:alnum:]_-]*)
  82 NOT_NAME        [^[:alpha:]_*\n]+
  83
  84 SCNAME          {NAME}
  85
  86 ESCSEQ          (\\([^\n]|[0-7]{1,3}|x[[:xdigit:]]{1,2}))
  87
  88 FIRST_CCL_CHAR  ([^\\\n]|{ESCSEQ})
  89 CCL_CHAR        ([^\\\n\]]|{ESCSEQ})
  90 CCL_EXPR        ("[:"[[:alpha:]]+":]")
  91
  92 LEXOPT          [aceknopr]
  93
  94 %%
  95         static int bracelevel, didadef, indented_code;
  96         static int doing_rule_action = false;
  97         static int option_sense;
  98
  99         int doing_codeblock = false;
 100         int i;
 101         Char nmdef[MAXLINE], myesc();
 102
 103
 104 <INITIAL>{
 105         ^{WS}           indented_code = true; BEGIN(CODEBLOCK);
 106         ^"/*"           ACTION_ECHO; yy_push_state( COMMENT );
 107         ^#{OPTWS}line{WS}       yy_push_state( LINEDIR );
 108         ^"%s"{NAME}?    return SCDECL;
 109         ^"%x"{NAME}?    return XSCDECL;
 110         ^"%{".*{NL}     {
 111                         ++linenum;
 112                         line_directive_out( (FILE *) 0, 1 );
 113                         indented_code = false;
 114                         BEGIN(CODEBLOCK);
 115                         }
 116
 117         {WS}            /* discard */
 118
 119         ^"%%".*         {
 120                         sectnum = 2;
 121                         bracelevel = 0;
 122                         mark_defs1();
 123                         line_directive_out( (FILE *) 0, 1 );
 124                         BEGIN(SECT2PROLOG);
 125                         return SECTEND;
 126                         }
 127
 128         ^"%pointer".*{NL}       yytext_is_array = false; ++linenum;
 129         ^"%array".*{NL}         yytext_is_array = true; ++linenum;
 130
 131         ^"%option"      BEGIN(OPTION); return OPTION_OP;
 132
 133         ^"%"{LEXOPT}{OPTWS}[[:digit:]]*{OPTWS}{NL}      ++linenum; /* ignore */
 134         ^"%"{LEXOPT}{WS}.*{NL}  ++linenum;      /* ignore */
 135
 136         ^"%"[^sxaceknopr{}].*   synerr( _( "unrecognized '%' directive" ) );
 137
 138         ^{NAME}         {
 139                         strcpy( nmstr, yytext );
 140                         didadef = false;
 141                         BEGIN(PICKUPDEF);
 142                         }
 143
 144         {SCNAME}        RETURNNAME;
 145         ^{OPTWS}{NL}    ++linenum; /* allows blank lines in section 1 */
 146         {OPTWS}{NL}     ACTION_ECHO; ++linenum; /* maybe end of comment line */
 147 }
 148
 149
 150 <COMMENT>{
 151         "*/"            ACTION_ECHO; yy_pop_state();
 152         "*"             ACTION_ECHO;
 153         [^*\n]+         ACTION_ECHO;
 154         [^*\n]*{NL}     ++linenum; ACTION_ECHO;
 155 }
 156
 157 <LINEDIR>{
 158         \n              yy_pop_state();
 159         [[:digit:]]+    linenum = myctoi( yytext );
 160
 161         \"[^"\n]*\"     {
 162                         flex_free( (void *) infilename );
 163                         infilename = copy_string( yytext + 1 );
 164                         infilename[strlen( infilename ) - 1] = '\0';
 165                         }
 166         .               /* ignore spurious characters */
 167 }
 168
 169 <CODEBLOCK>{
 170         ^"%}".*{NL}     ++linenum; BEGIN(INITIAL);
 171
 172         {NAME}|{NOT_NAME}|.     ACTION_ECHO;
 173
 174         {NL}            {
 175                         ++linenum;
 176                         ACTION_ECHO;
 177                         if ( indented_code )
 178                                 BEGIN(INITIAL);
 179                         }
 180 }
 181
 182
 183 <PICKUPDEF>{
 184         {WS}            /* separates name and definition */
 185
 186         {NOT_WS}.*      {
 187                         strcpy( (char *) nmdef, yytext );
 188
 189                         /* Skip trailing whitespace. */
 190                         for ( i = strlen( (char *) nmdef ) - 1;
 191                               i >= 0 && (nmdef[i] == ' ' || nmdef[i] == '\t');
 192                               --i )
 193                                 ;
 194
 195                         nmdef[i + 1] = '\0';
 196
 197                         ndinstal( nmstr, nmdef );
 198                         didadef = true;
 199                         }
 200
 201         {NL}            {
 202                         if ( ! didadef )
 203                                 synerr( _( "incomplete name definition" ) );
 204                         BEGIN(INITIAL);
 205                         ++linenum;
 206                         }
 207 }
 208
 209
 210 <OPTION>{
 211         {NL}            ++linenum; BEGIN(INITIAL);
 212         {WS}            option_sense = true;
 213
 214         "="             return '=';
 215
 216         no              option_sense = ! option_sense;
 217
 218         7bit            csize = option_sense ? 128 : 256;
 219         8bit            csize = option_sense ? 256 : 128;
 220
 221         align           long_align = option_sense;
 222         always-interactive      {
 223                         action_define( "YY_ALWAYS_INTERACTIVE", option_sense );
 224                         }
 225         array           yytext_is_array = option_sense;
 226         backup          backing_up_report = option_sense;
 227         batch           interactive = ! option_sense;
 228         "c++"           C_plus_plus = option_sense;
 229         caseful|case-sensitive          caseins = ! option_sense;
 230         caseless|case-insensitive       caseins = option_sense;
 231         debug           ddebug = option_sense;
 232         default         spprdflt = ! option_sense;
 233         ecs             useecs = option_sense;
 234         fast            {
 235                         useecs = usemecs = false;
 236                         use_read = fullspd = true;
 237                         }
 238         full            {
 239                         useecs = usemecs = false;
 240                         use_read = fulltbl = true;
 241                         }
 242         input           ACTION_IFDEF("YY_NO_INPUT", ! option_sense);
 243         interactive     interactive = option_sense;
 244         lex-compat      lex_compat = option_sense;
 245         main            {
 246                         action_define( "YY_MAIN", option_sense );
 247                         do_yywrap = ! option_sense;
 248                         }
 249         meta-ecs        usemecs = option_sense;
 250         never-interactive       {
 251                         action_define( "YY_NEVER_INTERACTIVE", option_sense );
 252                         }
 253         perf-report     performance_report += option_sense ? 1 : -1;
 254         pointer         yytext_is_array = ! option_sense;
 255         read            use_read = option_sense;
 256         reject          reject_really_used = option_sense;
 257         stack           action_define( "YY_STACK_USED", option_sense );
 258         stdinit         do_stdinit = option_sense;
 259         stdout          use_stdout = option_sense;
 260         unput           ACTION_IFDEF("YY_NO_UNPUT", ! option_sense);
 261         verbose         printstats = option_sense;
 262         warn            nowarn = ! option_sense;
 263         yylineno        do_yylineno = option_sense;
 264         yymore          yymore_really_used = option_sense;
 265         yywrap          do_yywrap = option_sense;
 266
 267         yy_push_state   ACTION_IFDEF("YY_NO_PUSH_STATE", ! option_sense);
 268         yy_pop_state    ACTION_IFDEF("YY_NO_POP_STATE", ! option_sense);
 269         yy_top_state    ACTION_IFDEF("YY_NO_TOP_STATE", ! option_sense);
 270
 271         yy_scan_buffer  ACTION_IFDEF("YY_NO_SCAN_BUFFER", ! option_sense);
 272         yy_scan_bytes   ACTION_IFDEF("YY_NO_SCAN_BYTES", ! option_sense);
 273         yy_scan_string  ACTION_IFDEF("YY_NO_SCAN_STRING", ! option_sense);
 274
 275         outfile         return OPT_OUTFILE;
 276         prefix          return OPT_PREFIX;
 277         yyclass         return OPT_YYCLASS;
 278
 279         \"[^"\n]*\"     {
 280                         strcpy( nmstr, yytext + 1 );
 281                         nmstr[strlen( nmstr ) - 1] = '\0';
 282                         return NAME;
 283                         }
 284
 285         (([a-mo-z]|n[a-np-z])[[:alpha:]\-+]*)|. {
 286                         format_synerr( _( "unrecognized %%option: %s" ),
 287                                 yytext );
 288                         BEGIN(RECOVER);
 289                         }
 290 }
 291
 292 <RECOVER>.*{NL}         ++linenum; BEGIN(INITIAL);
 293
 294
 295 <SECT2PROLOG>{
 296         ^"%{".* ++bracelevel; yyless( 2 );      /* eat only %{ */
 297         ^"%}".* --bracelevel; yyless( 2 );      /* eat only %} */
 298
 299         ^{WS}.* ACTION_ECHO;    /* indented code in prolog */
 300
 301         ^{NOT_WS}.*     {       /* non-indented code */
 302                         if ( bracelevel <= 0 )
 303                                 { /* not in %{ ... %} */
 304                                 yyless( 0 );    /* put it all back */
 305                                 yy_set_bol( 1 );
 306                                 mark_prolog();
 307                                 BEGIN(SECT2);
 308                                 }
 309                         else
 310                                 ACTION_ECHO;
 311                         }
 312
 313         .*              ACTION_ECHO;
 314         {NL}    ++linenum; ACTION_ECHO;
 315
 316         <<EOF>>         {
 317                         mark_prolog();
 318                         sectnum = 0;
 319                         yyterminate(); /* to stop the parser */
 320                         }
 321 }
 322
 323 <SECT2>{
 324         ^{OPTWS}{NL}    ++linenum; /* allow blank lines in section 2 */
 325
 326         ^{OPTWS}"%{"    {
 327                         indented_code = false;
 328                         doing_codeblock = true;
 329                         bracelevel = 1;
 330                         BEGIN(PERCENT_BRACE_ACTION);
 331                         }
 332
 333         ^{OPTWS}"<"     BEGIN(SC); return '<';
 334         ^{OPTWS}"^"     return '^';
 335         \"              BEGIN(QUOTE); return '"';
 336         "{"/[[:digit:]] BEGIN(NUM); return '{';
 337         "$"/([[:blank:]]|{NL})  return '$';
 338
 339         {WS}"%{"                {
 340                         bracelevel = 1;
 341                         BEGIN(PERCENT_BRACE_ACTION);
 342
 343                         if ( in_rule )
 344                                 {
 345                                 doing_rule_action = true;
 346                                 in_rule = false;
 347                                 return '\n';
 348                                 }
 349                         }
 350         {WS}"|".*{NL}   continued_action = true; ++linenum; return '\n';
 351
 352         ^{WS}"/*"       {
 353                         yyless( yyleng - 2 );   /* put back '/', '*' */
 354                         bracelevel = 0;
 355                         continued_action = false;
 356                         BEGIN(ACTION);
 357                         }
 358
 359         ^{WS}           /* allow indented rules */
 360
 361         {WS}            {
 362                         /* This rule is separate from the one below because
 363                          * otherwise we get variable trailing context, so
 364                          * we can't build the scanner using -{f,F}.
 365                          */
 366                         bracelevel = 0;
 367                         continued_action = false;
 368                         BEGIN(ACTION);
 369
 370                         if ( in_rule )
 371                                 {
 372                                 doing_rule_action = true;
 373                                 in_rule = false;
 374                                 return '\n';
 375                                 }
 376                         }
 377
 378         {OPTWS}{NL}     {
 379                         bracelevel = 0;
 380                         continued_action = false;
 381                         BEGIN(ACTION);
 382                         unput( '\n' );  /* so <ACTION> sees it */
 383
 384                         if ( in_rule )
 385                                 {
 386                                 doing_rule_action = true;
 387                                 in_rule = false;
 388                                 return '\n';
 389                                 }
 390                         }
 391
 392         ^{OPTWS}"<<EOF>>"       |
 393         "<<EOF>>"       return EOF_OP;
 394
 395         ^"%%".*         {
 396                         sectnum = 3;
 397                         BEGIN(SECT3);
 398                         yyterminate(); /* to stop the parser */
 399                         }
 400
 401         "["({FIRST_CCL_CHAR}|{CCL_EXPR})({CCL_CHAR}|{CCL_EXPR})*        {
 402                         int cclval;
 403
 404                         strcpy( nmstr, yytext );
 405
 406                         /* Check to see if we've already encountered this
 407                          * ccl.
 408                          */
 409                         if ( (cclval = ccllookup( (Char *) nmstr )) != 0 )
 410                                 {
 411                                 if ( input() != ']' )
 412                                         synerr( _( "bad character class" ) );
 413
 414                                 yylval = cclval;
 415                                 ++cclreuse;
 416                                 return PREVCCL;
 417                                 }
 418                         else
 419                                 {
 420                                 /* We fudge a bit.  We know that this ccl will
 421                                  * soon be numbered as lastccl + 1 by cclinit.
 422                                  */
 423                                 cclinstal( (Char *) nmstr, lastccl + 1 );
 424
 425                                 /* Push back everything but the leading bracket
 426                                  * so the ccl can be rescanned.
 427                                  */
 428                                 yyless( 1 );
 429
 430                                 BEGIN(FIRSTCCL);
 431                                 return '[';
 432                                 }
 433                         }
 434
 435         "{"{NAME}"}"    {
 436                         register Char *nmdefptr;
 437                         Char *ndlookup();
 438
 439                         strcpy( nmstr, yytext + 1 );
 440                         nmstr[yyleng - 2] = '\0';  /* chop trailing brace */
 441
 442                         if ( (nmdefptr = ndlookup( nmstr )) == 0 )
 443                                 format_synerr(
 444                                         _( "undefined definition {%s}" ),
 445                                                 nmstr );
 446
 447                         else
 448                                 { /* push back name surrounded by ()'s */
 449                                 int len = strlen( (char *) nmdefptr );
 450
 451                                 if ( lex_compat || nmdefptr[0] == '^' ||
 452                                      (len > 0 && nmdefptr[len - 1] == '$') )
 453                                         { /* don't use ()'s after all */
 454                                         PUT_BACK_STRING((char *) nmdefptr, 0);
 455
 456                                         if ( nmdefptr[0] == '^' )
 457                                                 BEGIN(CARETISBOL);
 458                                         }
 459
 460                                 else
 461                                         {
 462                                         unput(')');
 463                                         PUT_BACK_STRING((char *) nmdefptr, 0);
 464                                         unput('(');
 465                                         }
 466                                 }
 467                         }
 468
 469         [/|*+?.(){}]    return (unsigned char) yytext[0];
 470         .               RETURNCHAR;
 471 }
 472
 473
 474 <SC>{
 475         [,*]            return (unsigned char) yytext[0];
 476         ">"             BEGIN(SECT2); return '>';
 477         ">"/^           BEGIN(CARETISBOL); return '>';
 478         {SCNAME}        RETURNNAME;
 479         .               {
 480                         format_synerr( _( "bad <start condition>: %s" ),
 481                                 yytext );
 482                         }
 483 }
 484
 485 <CARETISBOL>"^"         BEGIN(SECT2); return '^';
 486
 487
 488 <QUOTE>{
 489         [^"\n]          RETURNCHAR;
 490         \"              BEGIN(SECT2); return '"';
 491
 492         {NL}            {
 493                         synerr( _( "missing quote" ) );
 494                         BEGIN(SECT2);
 495                         ++linenum;
 496                         return '"';
 497                         }
 498 }
 499
 500
 501 <FIRSTCCL>{
 502         "^"/[^-\]\n]    BEGIN(CCL); return '^';
 503         "^"/("-"|"]")   return '^';
 504         .               BEGIN(CCL); RETURNCHAR;
 505 }
 506
 507 <CCL>{
 508         -/[^\]\n]       return '-';
 509         [^\]\n]         RETURNCHAR;
 510         "]"             BEGIN(SECT2); return ']';
 511         .|{NL}          {
 512                         synerr( _( "bad character class" ) );
 513                         BEGIN(SECT2);
 514                         return ']';
 515                         }
 516 }
 517
 518 <FIRSTCCL,CCL>{
 519         "[:alnum:]"     BEGIN(CCL); return CCE_ALNUM;
 520         "[:alpha:]"     BEGIN(CCL); return CCE_ALPHA;
 521         "[:blank:]"     BEGIN(CCL); return CCE_BLANK;
 522         "[:cntrl:]"     BEGIN(CCL); return CCE_CNTRL;
 523         "[:digit:]"     BEGIN(CCL); return CCE_DIGIT;
 524         "[:graph:]"     BEGIN(CCL); return CCE_GRAPH;
 525         "[:lower:]"     BEGIN(CCL); return CCE_LOWER;
 526         "[:print:]"     BEGIN(CCL); return CCE_PRINT;
 527         "[:punct:]"     BEGIN(CCL); return CCE_PUNCT;
 528         "[:space:]"     BEGIN(CCL); return CCE_SPACE;
 529         "[:upper:]"     BEGIN(CCL); return CCE_UPPER;
 530         "[:xdigit:]"    BEGIN(CCL); return CCE_XDIGIT;
 531         {CCL_EXPR}      {
 532                         format_synerr(
 533                                 _( "bad character class expression: %s" ),
 534                                         yytext );
 535                         BEGIN(CCL); return CCE_ALNUM;
 536                         }
 537 }
 538
 539 <NUM>{
 540         [[:digit:]]+    {
 541                         yylval = myctoi( yytext );
 542                         return NUMBER;
 543                         }
 544
 545         ","             return ',';
 546         "}"             BEGIN(SECT2); return '}';
 547
 548         .               {
 549                         synerr( _( "bad character inside {}'s" ) );
 550                         BEGIN(SECT2);
 551                         return '}';
 552                         }
 553
 554         {NL}            {
 555                         synerr( _( "missing }" ) );
 556                         BEGIN(SECT2);
 557                         ++linenum;
 558                         return '}';
 559                         }
 560 }
 561
 562
 563 <PERCENT_BRACE_ACTION>{
 564         {OPTWS}"%}".*           bracelevel = 0;
 565
 566         <ACTION>"/*"            ACTION_ECHO; yy_push_state( COMMENT );
 567
 568         <CODEBLOCK,ACTION>{
 569                 "reject"        {
 570                         ACTION_ECHO;
 571                         CHECK_REJECT(yytext);
 572                         }
 573                 "yymore"        {
 574                         ACTION_ECHO;
 575                         CHECK_YYMORE(yytext);
 576                         }
 577         }
 578
 579         {NAME}|{NOT_NAME}|.     ACTION_ECHO;
 580         {NL}            {
 581                         ++linenum;
 582                         ACTION_ECHO;
 583                         if ( bracelevel == 0 ||
 584                              (doing_codeblock && indented_code) )
 585                                 {
 586                                 if ( doing_rule_action )
 587                                         add_action( "\tYY_BREAK\n" );
 588
 589                                 doing_rule_action = doing_codeblock = false;
 590                                 BEGIN(SECT2);
 591                                 }
 592                         }
 593 }
 594
 595
 596         /* Reject and YYmore() are checked for above, in PERCENT_BRACE_ACTION */
 597 <ACTION>{
 598         "{"             ACTION_ECHO; ++bracelevel;
 599         "}"             ACTION_ECHO; --bracelevel;
 600         [^[:alpha:]_{}"'/\n]+   ACTION_ECHO;
 601         {NAME}          ACTION_ECHO;
 602         "'"([^'\\\n]|\\.)*"'"   ACTION_ECHO; /* character constant */
 603         \"              ACTION_ECHO; BEGIN(ACTION_STRING);
 604         {NL}            {
 605                         ++linenum;
 606                         ACTION_ECHO;
 607                         if ( bracelevel == 0 )
 608                                 {
 609                                 if ( doing_rule_action )
 610                                         add_action( "\tYY_BREAK\n" );
 611
 612                                 doing_rule_action = false;
 613                                 BEGIN(SECT2);
 614                                 }
 615                         }
 616         .               ACTION_ECHO;
 617 }
 618
 619 <ACTION_STRING>{
 620         [^"\\\n]+       ACTION_ECHO;
 621         \\.             ACTION_ECHO;
 622         {NL}            ++linenum; ACTION_ECHO;
 623         \"              ACTION_ECHO; BEGIN(ACTION);
 624         .               ACTION_ECHO;
 625 }
 626
 627 <COMMENT,ACTION,ACTION_STRING><<EOF>>   {
 628                         synerr( _( "EOF encountered inside an action" ) );
 629                         yyterminate();
 630                         }
 631
 632
 633 <SECT2,QUOTE,FIRSTCCL,CCL>{ESCSEQ}      {
 634                         yylval = myesc( (Char *) yytext );
 635
 636                         if ( YY_START == FIRSTCCL )
 637                                 BEGIN(CCL);
 638
 639                         return CHAR;
 640                         }
 641
 642
 643 <SECT3>{
 644         .*(\n?)         ECHO;
 645         <<EOF>>         sectnum = 0; yyterminate();
 646 }
 647
 648 <*>.|\n                 format_synerr( _( "bad character: %s" ), yytext );
 649
 650 %%
 651
 652
 653 int yywrap()
 654         {
 655         if ( --num_input_files > 0 )
 656                 {
 657                 set_input_file( *++input_files );
 658                 return 0;
 659                 }
 660
 661         else
 662                 return 1;
 663         }
 664
 665
 666 /* set_input_file - open the given file (if NULL, stdin) for scanning */
 667
 668 void set_input_file( file )
 669 char *file;
 670         {
 671         if ( file && strcmp( file, "-" ) )
 672                 {
 673                 infilename = copy_string( file );
 674                 yyin = fopen( infilename, "r" );
 675
 676                 if ( yyin == NULL )
 677                         lerrsf( _( "can't open %s" ), file );
 678                 }
 679
 680         else
 681                 {
 682                 yyin = stdin;
 683                 infilename = copy_string( "<stdin>" );
 684                 }
 685
 686         linenum = 1;
 687         }
 688
 689
 690 /* Wrapper routines for accessing the scanner's malloc routines. */
 691
 692 void *flex_alloc( size )
 693 size_t size;
 694         {
 695         return (void *) malloc( size );
 696         }
 697
 698 void *flex_realloc( ptr, size )
 699 void *ptr;
 700 size_t size;
 701         {
 702         return (void *) realloc( ptr, size );
 703         }
 704
 705 void flex_free( ptr )
 706 void *ptr;
 707         {
 708         if ( ptr )
 709                 free( ptr );
 710         }